setTimes should support only for files and move the mtime&atime fields down to 
iNodeFile.
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                 Key: HDFS-2712
                 URL: https://issues.apache.org/jira/browse/HDFS-2712
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.23.0, 0.24.0
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


After the dicussion in HDFS-2436, unsupported behaviour for setTimes was 
intentional (HADOOP-1869).

But current INode structure hierarchy seems, it supports atime and mtime for 
directories also. But as per HADOOP-1869, we are supporting only for files. To 
avoid the confusions, we can move the mtime and atime fields to INodeFile as we 
planned to support setTimes only for files. And also restrict the support for 
setTimes on directories ( which is implemented with HDFS-2436 ).


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